<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="roleList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class = "['bdbottom','vcenter', index==0?'':'bdtop']" v-for = '(item1, index) in scope.row.children' :key="item1.id">
              <!-- 一级权限渲染 -->
              <el-col :span='5'>
                <el-tag closable @close="removeRightById(scope.row,item1.id)" >{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
               <!-- 二三级权限渲染 -->
              <el-col :span='19'>
                <!-- 二级权限渲染 -->
                <el-row :class = "[i2==0?'':'bdtop','vcenter']" v-for = '(item2, i2) in item1.children' :key="item2.id">
                  <el-col :span='6'>
                    <el-tag closable @close="removeRightById(scope.row,item2.id)" type="success">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span='18'>
                    <el-tag closable @close="removeRightById(scope.row,item3.id)" type="warning" v-for = '(item3) in item2.children' :key="item3.id">{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <el-table-column label = "#" type="index"></el-table-column>
        <el-table-column label = "角色名称" prop="roleName"></el-table-column>
        <el-table-column label = "角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label = "操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" @click="showSetRightDialog(scope.row)" type="warning" icon="el-icon-setting">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close = "setRightDialogClosed"
      >
      <!-- 树形控件 -->
     <el-tree
      :data="rightsList"
      show-checkbox
      node-key="id"
      default-expand-all
      :default-checked-keys="defKeys"
      ref="treeRef"
      :props="treeProps">
    </el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配角色"
      :visible.sync="setRoleDialogVisible"
      width="50%"
      >
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="setRoleDialogVisible = false">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  name: 'Roles',
  data () {
    return {
      // 所以角色列表数据
      roleList: [],
      // 控制分配权限对话款的显示和隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 树形控件对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选择的ID数组
      defKeys: [],
      // 当前即将分配权限的id
      roleId: '',
      setRoleDialogVisible: false
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error(res?.meta?.msg || '获取角色列表失败！')
      }
      this.roleList = res.data
    },
    // 根据ID删除对于的权限
    async removeRightById (role, rightId) {
      // 弹框提醒用户
      const confirmResult = await this.$confirm('此操作将永久删除该用户, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果用户确认删除，则返回值为字符串 confirm
      // 如果用户取消删除，则返回值为字符串 cancle
      if (confirmResult === 'confirm') {
        const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if (res.meta.status !== 200) {
          return this.$message.error(res?.meta?.msg || '删除权限失败！')
        }
        // 重新刷新用户的列表
        role.children = res.data
        this.$message.success('删除成功!');
      } else {
        return this.$message.info('取消删除！')
      }
    },
    // 展示分配权限的对话框
    async showSetRightDialog (op) {
      this.roleId = op.id
      // 获取权限所有数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error(res?.meta?.msg || '获取权限失败！')
      }
      // 把获取到的权限数据保存到rightsList
      this.rightsList = res.data
      // 递归获取三级节点
      this.getLeafKeys(op, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归函数的形式获取角色下的三级权限id，并保存到defKeys数组中
    // 如果nod中不包含children就不是三级节点
    getLeafKeys (node, arr) {
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(val => {
        this.getLeafKeys(val, arr)
      })
    },
    // 监分配权限对话框的关闭事件
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error(res?.meta?.msg || '分配权限失败！')
      }
      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>
<style lang="less" scoped>
  .el-tag{
    margin: 7px;
  }
  .bdtop{
    border-top: 1px solid #eee;
  }
  .bdbottom{
    border-bottom: 1px solid #eee;
  }
  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
